AIX licensing

Where to find clearly explained AIX licensing policies?
I have read some info (and some with AIX media delivered) but I cannot find
clear information how does licensing works: per processor, per active
processor, user, LPAR? Or whatever?

As than example, if you have a 4 core machine with 3 active, then
you need to have a 3 core licence, if you have 3.5 cores active,
that is you have a number of lpars and micro lpars totaling 3.5
processors worth, then you need 4 processors worth of licences.

NB in IBM speak, a core is a processor, in power5+ the cores are
packaged in dual or quad core modules (DCM, QCM), the DCM will
have 2 cores (processors) in the same physical package.

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